this is my code
how to make filter works?
and this my arrayAdapter
package com.example.android.emanprice;
import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.content.ContextCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class WordAdapter extends ArrayAdapter<Word> {
private ArrayList<Word> wordListFull;
private ArrayList<Word> words = null;
private int mColorResourceId;
public WordAdapter(Activity context, ArrayList<Word> words, int colorResourceId) {
// Here, we initialize the ArrayAdapter's internal storage for the context and the list.
// the second argument is used when the ArrayAdapter is populating a single TextView.
// Because this is a custom adapter for two TextViews and an ImageView, the adapter is not
// going to use this second argument, so it can be any value. Here, we used 0.
super(context, 0, words);
mColorResourceId = colorResourceId;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
// Check if the existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
// Get the object located at this position in the list
Word currentWord = getItem(position);
//Find the TextView in the list_item.xml layout with the ID version_name
TextView modelNameTextView = listItemView.findViewById(R.id.modelName_text_view);
modelNameTextView.setText(currentWord.getModelName());
TextView modelPriceTextView = listItemView.findViewById(R.id.modelPrice_text_view);
modelPriceTextView.setText(currentWord.getModelPrice());
ImageView iconView = listItemView.findViewById(R.id.list_item_image);
iconView.setImageResource(currentWord.getImageResourceID());
// Set the theme color for the list item
View textContainer = listItemView.findViewById(R.id.text_container);
// Find the color that the resource ID maps to
int color = ContextCompat.getColor(getContext(), mColorResourceId);
textContainer.setBackgroundColor(color);
// Return the whole list item layout (containing 2 TextViews )
// so that it can be shown in the ListView
return listItemView;
}
// Filter Class
public void filter(String charText) {
charText = charText.toUpperCase(Locale.getDefault());
words.clear();
if (charText.length() == 0) {
words.addAll(wordListFull);
} else {
for (Word wp : words) {
if (wp.getModelName().toLowerCase(Locale.getDefault()).contains(charText)) {
wordListFull.add(wp);
}
}
}
notifyDataSetChanged();
}
}
the crush happens when call filter method
public void filter(String charText) {
charText = charText.toUpperCase(Locale.getDefault());
words.clear();
if (charText.length() == 0) {
words.addAll(wordListFull);
} else {
for (Word wp : words) {
if
(wp.getModelName().toLowerCase(Locale.getDefault()).contains(charText)) {
wordListFull.add(wp);
}
}
}
notifyDataSetChanged();
}
pleas help me to fix error
the activity class and arrayList:
package com.example.android.emanprice;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.TextView;
import java.util.Locale;
public class BabyActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.word_list);
final ArrayList<Word> words = new ArrayList<Word>();
// Create an array of words
// Create a list of words
words.add(new Word("1050", "012 بيبي", R.drawable.ic_012_));
words.add(new Word("1250", "035بى بى", R.drawable.ic_035_));
words.add(new Word("1500", "1019 بيبي", R.drawable.ic_1019_));
words.add(new Word("1500", "1065 بيبي", R.drawable.ic_1065_));
words.add(new Word("1500", "1089 بيبي", R.drawable.ic_1089_));
words.add(new Word("1200", "1093 بيبي", R.drawable.ic_1093_));
words.add(new Word("1500", "1095 بيبي", R.drawable.ic_1095_));
words.add(new Word("1500", "1098 بيبي", R.drawable.ic_1098_));
words.add(new Word("1500", "1099 بيبي", R.drawable.ic_1099_));
words.add(new Word("1500", "1105 بيبي", R.drawable.ic_1105_));
words.add(new Word("900", "1602 بيبي", R.drawable.ic_1602_));
words.add(new Word("900", "1775 بيبي", R.drawable.ic_1775_));
words.add(new Word("900", "1783 بيبي", R.drawable.ic_1783_));
words.add(new Word("850", "1888 بيبي", R.drawable.ic_1888_));
words.add(new Word("1400", "2588B بيبي", R.drawable.ic_2588b_));
words.add(new Word("1400", "2715B بيبي", R.drawable.ic_2715b_));
words.add(new Word("1400", "2736B بيبي", R.drawable.ic_2736b_));
words.add(new Word("1500", "2738B بيبي", R.drawable.ic_2738b_));
words.add(new Word("1400", "2750B بيبي", R.drawable.ic_2750b_));
words.add(new Word("1100", "3003 بيبي", R.drawable.ic_3003_));
words.add(new Word("1100", "3005 بيبي", R.drawable.ic_3005_));
words.add(new Word("1100", "3023 بيبي", R.drawable.ic_3023_));
words.add(new Word("850", "353 بيبي", R.drawable.ic_353_));
words.add(new Word("1150", "505356636بيبي", R.drawable.ic_505356636));
words.add(new Word("1450", "609بي بي", R.drawable.ic_609_));
words.add(new Word("1500", "80-10 بيبي", R.drawable.ic_80_10_));
words.add(new Word("1350", "80-11 بيبي", R.drawable.ic_80_11_));
words.add(new Word("1450", "80-12 بيبي", R.drawable.ic_80_12_));
words.add(new Word("1450", "80-13 بيبي", R.drawable.ic_80_13_));
words.add(new Word("1450", "80-14 بيبي", R.drawable.ic_80_14_));
words.add(new Word("1450", "80-20 بيبي", R.drawable.ic_80_20_));
words.add(new Word("1200", "80-5 بيبي", R.drawable.ic_80_5_));
words.add(new Word("1350", "80-7 كنترة بيبي", R.drawable.ic_80_7__));
words.add(new Word("1400", "80-9 بيبي", R.drawable.ic_80_9_));
words.add(new Word("1100", "8362007 بيبي", R.drawable.ic_8362007_));
words.add(new Word("1100", "8371021 بيبي", R.drawable.ic_8371021_));
words.add(new Word("1600", "8802بيبي", R.drawable.ic_8802_));
words.add(new Word("1600", "9903بيبي", R.drawable.ic_9903));
words.add(new Word("1050", "AT3069 بيبي", R.drawable.ic_at3069_));
words.add(new Word("1250", "AT3120 بيبي", R.drawable.ic_at3120_));
words.add(new Word("1150", "B001 بيبي", R.drawable.ic_b001_));
words.add(new Word("1100", "B002 كنترة بيبي", R.drawable.ic_b002__));
words.add(new Word("950", "B011 بيبي", R.drawable.ic_b011_));
words.add(new Word("900", "B1625", R.drawable.ic_b1625));
words.add(new Word("1150", "B67 بيبي", R.drawable.ic_b67_));
words.add(new Word("1150", "B6715 بيبي", R.drawable.ic_b6715_));
words.add(new Word("1150", "B6716 كنترة بيبي", R.drawable.ic_b6716__));
words.add(new Word("950", "B6761 بيبي", R.drawable.ic_b6761_));
words.add(new Word("1100", "B6926 بيبي", R.drawable.ic_b6926_));
words.add(new Word("1250", "B7006 بيبي", R.drawable.ic_b7006_));
words.add(new Word("950", "B82 بيبي", R.drawable.ic_b82_));
words.add(new Word("1100", "B8712 بيبي", R.drawable.ic_b8712_));
words.add(new Word("1000", "B9003 كنترة بيبي", R.drawable.ic_b9003__));
words.add(new Word("1100", "B9015 كنترة بيبي", R.drawable.ic_b9015__));
words.add(new Word("1100", "B9018 كنترة بيبي", R.drawable.ic_b9018__));
words.add(new Word("1650", "BB16-1", R.drawable.ic_bb16_1));
words.add(new Word("1200", "H066 بيبي", R.drawable.ic_h066_));
words.add(new Word("1300", "KB16-81", R.drawable.ic_kb16_81));
words.add(new Word("1500", "KB16-98", R.drawable.ic_kb16_98));
words.add(new Word("1500", "KB18-105", R.drawable.ic_kb18_105));
words.add(new Word("1170", "KB18-107", R.drawable.ic_kb18_107));
words.add(new Word("1170", "KB18-108", R.drawable.ic_kb18_108));
words.add(new Word("1000", "KB18-111", R.drawable.ic_kb18_111));
words.add(new Word("1000", "KB18-112", R.drawable.ic_kb18_112));
words.add(new Word("1000", "KB18-113", R.drawable.ic_kb18_113));
words.add(new Word("1000", "KB18-114", R.drawable.ic_kb18_114));
words.add(new Word("1000", "KB18-115", R.drawable.ic_kb18_115));
words.add(new Word("1000", "KB18-115-1", R.drawable.ic_kb18_115_1));
words.add(new Word("1000", "KB18-116", R.drawable.ic_kb18_116));
words.add(new Word("1000", "KB18-116-1", R.drawable.ic_kb18_116_1));
words.add(new Word("1500", "KB18-120", R.drawable.ic_kb18_120));
words.add(new Word("1250", "L-18 بيبي", R.drawable.ic_l_18_));
words.add(new Word("1100", "MQ001 بيبي", R.drawable.ic_mq001_));
// Create an {@link WordAdapter}, whose data source is a list of {@link Word}s. The
// adapter knows how to create list items for each item in the list.
final WordAdapter adapter = new WordAdapter(this, words, R.color.category_baby);
// Find the {@link ListView} object in the view hierarchy of the {@link Activity}.
// There should be a {@link ListView} with the view ID called list, which is declared in the
// word_list.xml file.
ListView listView = (ListView) findViewById(R.id.list);
// Make the {@link ListView} use the {@link WordAdapter} we created above, so that the
// {@link ListView} will display list items for each {@link Word} in the list.
listView.setAdapter(adapter);
final EditText editText= findViewById(R.id.search);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
String text = editText.getText().toString().toUpperCase(Locale.getDefault());
adapter.filter(text);
}
});
}
}
in Logcat show me this error
java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.ArrayList.clear()' on a null object reference
